微重力池沸腾现象中的汽泡行为特性  

BUBBLE BEHAVIOR IN MICROGRAVITY POOL BOILING

作　　者：李晶[1] 赵建福[1] 闫娜[1] 李震东[1] 大田治彦[2] 

机构地区：[1]中国科学院力学研究所国家微重力实验室,北京100080 [2]日本九州大学航空宇宙工学系,福冈812-8581

出　　处：《工程热物理学报》2008年第3期439-442,共4页Journal of Engineering Thermophysics

基　　金：中国科学院知识创新工程(No．KACX2-SW-02-03);国家自然科学基金资助项目(No．10432060)

摘　　要：本文对准稳态加热条件下的微重力核态池沸腾中的汽泡行为特征进行了实验研究,分析了初始核化过程、汽泡数密度、汽泡尺寸及其运动速度等的变化趋势,探讨了过冷度及加热历史等因素对相关特性的影响.实验发现。微重力条件下汽泡生成后沿加热面不停地移动;原生汽泡会聚合形成大汽泡,大汽泡不断捕掠小汽泡而长大,直到大汽泡覆盖整个加热面;汽泡生长速度随过冷度增加而变慢.In the present paper, the bubble behavior in subcooled pool boiling of FC-72 on a plain plate used a quasi-steady heating method has been studied experimentally in microgravity aboard the Chinese recoverable satellite S J-8. Based on the analyses of the number density, size and velocity of bubbles, and the nucleation process, the influence of subcooling and heating history are discussed. It＇s found that bubbles glide on the heating surface throughout the boiling process. They collide with each other and coalesce to form the bigger coalesced bubble. The bubble growing velocity decreases with the increase of subcooling.

关 键 词：微重力 核态池沸腾 汽泡 核化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]